Surface reaction and interaction of NO +CO on catalyst
The adsorption and reaction of NO with CO has been investigated on supported Au Catalysts. The main method was FT IR spectroscopy. Although very limited dissociation of NO was noticed on reduced Au catalyst, catalytic tests showed that all the samples used effectively catalyse the NO+CO reaction abo...
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| Dokumentumtípus: | Cikk |
| Megjelent: |
Szegedi Tudományegyetem Mezőgazdasági Kar
Szeged
2011
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| Sorozat: | Agrár- és vidékfejlesztési szemle
6 No. 1 |
| Kulcsszavak: | Színképelemzés, Adszorpció, Katalizátor |
| Tárgyszavak: | |
| Online Access: | http://acta.bibl.u-szeged.hu/76118 |
| Tartalmi kivonat: | The adsorption and reaction of NO with CO has been investigated on supported Au Catalysts. The main method was FT IR spectroscopy. Although very limited dissociation of NO was noticed on reduced Au catalyst, catalytic tests showed that all the samples used effectively catalyse the NO+CO reaction above 573 K. By means of FTIR spectroscopy several new absorption bands have been detected on the Au samples, the position of which depended on the nature of the support: it was 2305 cm-1 for Au/SiO2, 2256 cm-1 for Au/Al2O3, 2212 cm-1 for Au/TiO2 and 2220-2230 cm-1 for Au/MgO. These bands were attributed to the asymmetric stretch of NCO attached to the oxides. This idea was strengthened by the results obtained following HNCO adsorption on supports alone, which gave the same absorption bands. It was demonstrated and assumed that an NCO species is formed on Au crystallites, and then migrates from the Au onto the acceptor sites of the support where it is accumulated and stabilized. The Au-NCO species was characterized by an absorption band at 2185-2195 cm-1 produced either by the low temperature reaction or by the adsorption of HNCO on Au/SiO2. |
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| Terjedelem/Fizikai jellemzők: | 274-279 |
| ISSN: | 1788-5345 |